Category page shows nothing...

I have installed 2.0 b6

I am getting on a category page:
Sorry, we can't find the content you're looking for at this URL. Please try selecting a menu item from above or to the side of this message to get where you'd like to go.

Which I believe states for there is nothing to display. But in this category I have content.

I am using /%year%/%monthnum%/%day%/%postname%/ as permalin (any other not working at all)